Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Streamline the wording of this text:

The awesome thing about these bracelet patterns is that they are adjustable and customizable, so they easily fit all wrist sizes and you can add your own twist to the design! Just by using different colors of thread, you can get a whole new look.

These friendship bracelets are a fun project for kids of all ages and adults too! It’s a fun craft activity you can do together with best friends, sisters, mom, grandma and more.
Response: These friendship bracelet patterns are customizable so they can fit any size wrist and can be of any design or color for different looks. They are a fun project for all ages!

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Explain how natural selection works.
user
Natural selection is a process where organisms better adapted to their environment tend to survive and reproduce, passing on favorable traits to the next generation.
assistant